I want write a class and take input value like array
int arr[] = {1,2,3,4}
myFunc f = {a,b,c,d};
Is there any way my class take input value like array in C ?
CodePudding user response:
This is what std::initializer_list
is for:
#include <vector>
#include <iostream>
class foo {
private:
std::vector<int> nums_;
public:
foo(std::initializer_list<int> init) :
nums_(init.begin(), init.end())
{}
void display() {
for (auto n : nums_) {
std::cout << " " << n;
}
std::cout << "\n";
}
};
int main()
{
foo f = { 1,2,3,4 };
f.display();
return 0;
}
CodePudding user response:
You could try and pass a pointer to an array, as an example:
class B
{
public:
B(int* arr, const size_t len)
{
// Bad way:
// this->arr = arr;
// this->len = len;
// Better:
this->arr = new int[len];
this->len = len;
for (int i = 0; i < len; i )
{
this->arr[i] = arr[i];
}
}
void printArray() const
{
for (int i = 0; i < this->len; i )
{
std::cout << this->arr[i] << " ";
}
std::cout << std::endl;
}
int* arr;
size_t len;
};
int main()
{
int* arr = new int[10];
for (int i = 0; i < 10; i )
{
arr[i] = i 1;
}
B b(arr, 10);
b.printArray();
delete[] arr;
return 0;
}
But the problem is that it's not memory safe and not so useful since CPP's standard library provides better solutions.
For example, you might use std::vector